*{
    margin: 0;
    padding: 0;
}
body{
    background: #eee;
}
img{
   vertical-align: middle;
   height: 100%;
}
.banner{
    width: 100vw;
    position: relative;
    overflow: hidden;
}
.wrap{
    display: flex;
    width: 400vw;
    flex-wrap: nowrap;
}
.wrap a{
    width: 100vw;
}
.wrap a img{
    width: 100%;
}
.circle{
    position: absolute;
    bottom: 3vw;
    width: 100vw;
    display: flex;
    justify-content: center;
}
.circle span{
    width: 25px;
    height: 2px;
    background: rgba(255, 255, 255, .5);
    margin: 0 5px;
}
.circle span.active{
    background: rgb(255, 255, 255, 1);
}
